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7 Answers
7

I know in Mexico, "grout" is called "yeso". I have heard that in some countries, don't ask me which ones, it is also called "lechada".

About the "unsanded" part, honestly I have no idea what that means. At best I can only infer that since sand means "arena" maybe, big emphasis on the maybe, it means that the mixture of "yeso" or "lechada" should not contain sand.

I have looked for "yeso" and "lechada" in RAE and also for "yeso" in wikipedia but I was not lucky in trying to get more information for you.

The shop owner did know what we mean by using the word lechada.
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juergen dOct 29 '12 at 20:04

@juergend: Maybe now days it is much more common to use "yeso" instead. I'm glad that I was able to help.
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Sergio RomeroOct 29 '12 at 20:14

I just want to mention that, in Spain, lechada can be misunderstood and, instead of grout, people can think about semen. It's very, very vulgar, but, frankly, it's the first that came up to my mind. To keep it in mind, just in case.
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itzikiJun 5 '14 at 15:17

Word of warning: You are probably going to run into problems with folks who don't know the difference between mortar, grout and caulk.
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wordsmytheJul 7 '14 at 17:49